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Effect of Acid/Ethanol Ratio on Medium Chain Carboxylate Production with Different VFAs as the Electron Acceptor: Insight into Carbon Balance and Microbial Community

Author

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  • Shuai Bao

    (College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China)

  • Qingyan Wang

    (College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China)

  • Panyue Zhang

    (College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China
    School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404632, China)

  • Qi Zhang

    (College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China)

  • Yan Wu

    (School of Environmental and Chemical Engineering, Chongqing Three Gorges University, Chongqing 404632, China)

  • Fan Li

    (College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China)

  • Xue Tao

    (College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China)

  • Siqi Wang

    (College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China)

  • Mohammad Nabi

    (College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China)

  • Yazhou Zhou

    (College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China)

Abstract

Medium chain carboxylates (MCCs) are important precursors for biodiesel production. Using chain elongation to produce MCCs is an emerging bioenergy technology. In this study, batch tests were conducted to investigate fermentative MCC production through chain elongation from acetate, propionate, n -butyrate, and ethanol. The effect of the acid/ethanol ratio on MCC production by mixed culture was investigated. Better MCC production, especially n -caproate production, was achieved at optimal acid/ethanol ratios of 1:4, 1:3, and 1:2 with acetate, propionate, and n -butyrate as the electron acceptor, respectively. The n -caproate concentration was high, up to 41.54 mmol/L, and the highest n -caproate production efficiency was 57.96% with the n -butyrate/ethanol ratio of 1:2. The higher concentration of ethanol might stimulate the growth of chain elongation bacteria to promote chain elongation. The highest MCC production efficiency with different electron acceptors corresponded to less carbon loss and a higher chain elongation degree. In addition, with the optimal acid/ethanol ratio, the substrate was maximally utilized for chain elongation. The microbial community analysis confirmed the carbon balance analysis with the maximum relative abundance of 52.66–60.55% of the n -caproate producer Clostridium_sensu_stricto_12 enriched by the optimal acid/ethanol ratios with different volatile fatty acids (VFAs) as electron acceptors.

Suggested Citation

  • Shuai Bao & Qingyan Wang & Panyue Zhang & Qi Zhang & Yan Wu & Fan Li & Xue Tao & Siqi Wang & Mohammad Nabi & Yazhou Zhou, 2019. "Effect of Acid/Ethanol Ratio on Medium Chain Carboxylate Production with Different VFAs as the Electron Acceptor: Insight into Carbon Balance and Microbial Community," Energies, MDPI, vol. 12(19), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:19:p:3720-:d:271964
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    References listed on IDEAS

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    1. Grootscholten, T.I.M. & Strik, D.P.B.T.B. & Steinbusch, K.J.J. & Buisman, C.J.N. & Hamelers, H.V.M., 2014. "Two-stage medium chain fatty acid (MCFA) production from municipal solid waste and ethanol," Applied Energy, Elsevier, vol. 116(C), pages 223-229.
    2. Fang, Wei & Zhang, Panyue & Zhang, Xuedong & Zhu, Xuefeng & van Lier, Jules B. & Spanjers, Henri, 2018. "White rot fungi pretreatment to advance volatile fatty acid production from solid-state fermentation of solid digestate: Efficiency and mechanisms," Energy, Elsevier, vol. 162(C), pages 534-541.
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    1. Chao Liu & Yue Yin & Chuang Chen & Xuemeng Zhang & Jing Zhou & Qingran Zhang & Yinguang Chen, 2023. "Advances in Electricity-Steering Organic Waste Bio-Valorization for Medium Chain Carboxylic Acids Production," Energies, MDPI, vol. 16(6), pages 1-22, March.
    2. Gayathri Priya Iragavarapu & Syed Shahed Imam & Omprakash Sarkar & Srinivasula Venkata Mohan & Young-Cheol Chang & Motakatla Venkateswar Reddy & Sang-Hyoun Kim & Naresh Kumar Amradi, 2023. "Bioprocessing of Waste for Renewable Chemicals and Fuels to Promote Bioeconomy," Energies, MDPI, vol. 16(9), pages 1-24, May.

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